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EN 1.7220 Steel vs. EN 1.7779 Steel

Both EN 1.7220 steel and EN 1.7779 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.7220 steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 290
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 520 to 1720
810

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
470
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.8
Embodied Energy, MJ/kg 20
41
Embodied Water, L/kg 51
64

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 61
29
Strength to Weight: Bending, points 18 to 41
25
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 15 to 50
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.3 to 0.37
0.17 to 0.23
Chromium (Cr), % 0.9 to 1.2
3.0 to 3.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.8 to 98.1
93.8 to 95.4
Manganese (Mn), % 0.6 to 0.9
0.3 to 0.5
Molybdenum (Mo), % 0.15 to 0.3
0.5 to 0.6
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.010
Vanadium (V), % 0
0.45 to 0.55